Dongping Liao

National University of Defense Technology, Ch’ang-sha-shih, Hunan, China

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Publications (6)2.88 Total impact

  • Tianpeng Liu · Dongping Liao · Xizhang Wei · Lei Li
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    ABSTRACT: Due to the additional degrees of freedom, multiple-element cross-eye jamming (MCJ) can reduce tolerance sensitivity and increase the effective sector angle. In this paper, we investigate multiple-element retrodirective cross-eye jamming (MRCJ) based on the retrodirective linear array. The monopulse error and cross-eye gain are derived via trigonometric approximations. Moreover, excellent performances of MRCJ in terms of induced angular error and tolerance requirements are demonstrated in simulation results.
    No preview · Article · Jul 2015 · IEEE Transactions on Aerospace and Electronic Systems
  • Zhen Liu · Peng You · Xizhang Wei · Dongping Liao · Xiang Li
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    ABSTRACT: This paper focuses on the high resolution time-frequency distribution (TFD) of multicomponent signals with amplitude and frequency modulations, and a concise method named short-time sparse representation (STSR) is proposed. In STSR, both analysis and synthesis of the discrete signal can be achieved by exploiting the signal’s sparsity in frequency domain at each time instant. In order to fasten the STSR procedure, an efficient sparse recovery algorithm named SL0 is applied, and the signal model for each sliding window is modified to form the same dictionary, which guarantees that the whole recovery procedure adapts to the matrix form. The performance of STSR is compared with other TFD techniques and assessed in various configurations. It is shown that both preferable representation and acceptable computational cost can be obtained.
    No preview · Article · Dec 2014 · Circuits Systems and Signal Processing
  • Bin Sun · Xufeng Zhang · Dongping Liao · Xiang Li
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    ABSTRACT: In the context of widely distributed multiple-input-multiple-output (MIMO) radar, target localization accuracy is very sensitive to the knowledge of radar antenna positions. However, perfect knowledge of antenna positions is difficult to acquire even after calibration. This paper aims at investigating the impact of receiver antenna position uncertainties (APUs) on target localization performance. We model the APUs as random variables and derive the mean square error (MSE) as well as Cramér-Rao lower bound (CRLB) of location estimate. Simulations are provided to compare the obtained MSE and CRLB with those in the absence of receiver APUs cases in different antenna geometries. The results show that the target localization sensitivity (TLS) of MIMO radar is dependent not only on the bistatic geometry, but also on the APU power level as well as the signal-to-noise ratio (SNR).
    No preview · Conference Paper · Jun 2014
  • Meimei Fan · Dongping Liao · Xiaofeng Ding · Xiang Li
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    ABSTRACT: The optimal waveform for extended target recognition is directly affected by the target impulse response, which is sensitive to the target aspect. Hence, the variation of target aspect needs to be considered when the target is moving. Aiming at this problem, a new framework of cognitive radar is proposed. It predicts the new aspect via least square support vector machines (LSSVM) by using the prior knowledge of target aspect, and then obtains the optimal waveform based on not only the updated prior probabilities of the target hypothesis but also the updated TIR in a circular of interrogation. Simulations part shows the loss of recognition efficiency for a moving target when treated as static by the method in previous literature, and proves the validity of the proposed method.
    No preview · Article · Jan 2012
  • Meimei Fan · Dongping Liao · Xiaofeng Ding · Xiang Li
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    ABSTRACT: The existence of clutter in received waveform makes the waveform design a difficult problem. For the clutter is correlated with the transmitted signal, it comes to an iterative method in the traditional ways and is difficult to achieve an analytical solution. This paper presents a waveform design method in clutter for target recognition. It transforms the target recognition problem in complex WSS Gaussian clutter into a hypothesis test procedure with mean shift Gaussian-Gaussian probability distribution function. The optimum waveform is the one that maximizes the shift distance and the analytical solution can be obtained. The simulation results show that the recognition performance improves a lot when compared to the LFM signal with equal energy and bandwidth.
    No preview · Article · Jan 2011
  • Meimei Fan · Dongping Liao · Xiaofeng Ding · Weidong Jiang · Xiang Li
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    ABSTRACT: Target recognition performance can be affected by radar waveform parameters. In this paper, we established rigorous relationship between target recognition efficiency and the parameters of a repeatedly transmitted waveform. It is based on Kullback-Leibler Information Number of single observation (KLINs), which measures the dissimilarity between targets depicted by a range-velocity double spread density function in frequency domain. We considered two signal models which are different in the coherence of the observations. The method we proposed takes advantage of the methodology of sequential hypothesis test, and then the recognition performance in terms of correct classification rate is expressed by Receiver Operating Characteristic (ROC). Simulation results about the parameters of LFM signal show the validity of the method. Key wordsTarget recognition performance–Radar waveform parameter–Kullback-Leibler Information Number (KLIN)
    No preview · Article · Jan 2011 · Journal of Electronics (China)